TC7109A Datasheet | TelCom

FEATURES s Zero-Integrator Cycle for Fast Recovery From Input Overloads s Eliminates Cross -Talk in Multiplexed Systems s 12-Bit Plus Sign Integrating A/D Converter With Overrange Indication s Sign Magnitude Coding Format s True Differential Signal Input and Differential Reference Input s Low Noise 15 µVP-P Typ s Input Current 1 p A Typ s No Zero Adjustment Needed s TTL-patible, Byte-Organized Tri-State Outputs s UART Handshake Mode for Simple Serial Data Transmission ORDERING INFORMATION PART CODE A or blank- TC7109X Package Code Package Temperature Range 44-Pin PQFP 0°C to +70°C 44-Pin PLCC 0°C to +70°C 40-Pin Plastic DIP 0°C to +70°C 40-Pin Cer DIP - 25°C to +85°C - The "A" version has a higher IOUT on the digital lines. GENERAL DESCRIPTION The TC7109A is a 12-bit plus sign, CMOS low-power analog-to-digital converter (ADC). Only eight passive ponents and a crystal are required to form a plete dual-slope integrating ADC. The improved VOH source current TC7109A has features that make it an attractive per-channel alternative to analog multiplexing for many data acquisition applications. These features include typical input bias current of 1p A drift of less than 1µV/°C, input noise typically 15µVP-P, and auto-zero. True differential input and reference allow measurement of bridge-type transducers such as load cells, strain gauges, and temperature transducers. The TC7109A provides a versatile digital interface. In the direct mode, chip select and HIGH/LOW byte enables control parallel bus interface. In the handshake mode, the TC7109A will operate with industry-standard UARTs in controlling serial data transmission - ideal for remote data logging. Control and monitoring of conversion timing is provided by the RUN/HOLD input and STATUS output. For applications requiring more resolution, see the TC500, 15-bit plus sign ADC data sheet. The TC7109A...